Umpires, we have a dangerous concussion epidemic on our hands???heads.Earlier this week, MLB umpire Chad Fairchild took a 95-mile-per-hour sinker from Rockies pitcher Jeremy Guthrie to the center of his protective face mask, suffering a concussion that resulted in his withdrawal from the weekend's Rockies-Phillies series.Like most players and other officials, Fairchild toughed it out after his sev